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Molecular photoswitching. (a) Bond rotations currently evidenced in photoswitching. (b) Multistate switching approaches. (c) Simple and compact eight-state photoswitch possessing eight different isomeric states and carrying out a hitherto unknown dual single-bond rotation (DSBR) photoreaction (top). Changing conditions allow to branch between Hula-Twist or DSBR photoreactions allowing for two different sequential switching cycles (bottom).
